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  System and method for transmitting and receiving secret information, and wireless local communication device using the sameUSPTO Application #: 20070177725Title: System and method for transmitting and receiving secret information, and wireless local communication device using the same Abstract: A system and method for transmitting and receiving secret information, a device using the same, and a wireless local communication device. The system for transmitting and receiving secret information includes at least one device to generate a ciphertext using public key information that is received over a location-limited channel; and a wireless local communication device to transmit the public key information to the device over the location-limited channel and to decrypt the ciphertext generated at the device. Thus, the secret information can be securely transmitted and received between devices regardless of reliability of the transmission channel. (end of abstract) Agent: Staas & Halsey LLP - Washington, DC, US Inventors: USPTO Applicaton #: 20070177725 - Class: 380030000 (USPTO) Related Patent Categories: Cryptography, Particular Algorithmic Function Encoding, Public Key The Patent Description & Claims data below is from USPTO Patent Application 20070177725. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit under 35 U.S.C. .sctn. 119 (a) from Korean Patent Application No. 2004-117776 filed on Dec. 31, 2004 in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The invention relates generally to a system and method for transmitting and receiving secret information. More particularly, the invention relates to a system and method for securely transmitting and receiving secret information over a location-limited channel. [0004] 2. Description of the Related Art [0005] Recently, systems in which one server controls a plurality of devices over a network, such as home network systems, have come into wide use. When transmitting and receiving information over the network through such systems, private information may be accessible to others. [0006] In this regard, information encryption and decryption technology has been suggested. According to the encryption and decryption algorithm, information ready to transmit is encrypted with a key at a transmitting side, and a receiving side decrypts the received information with the key and recovers the original information. The encryption and decryption aims to protect information against review by others. [0007] The encryption and decryption algorithm include a symmetric key algorithm and an asymmetric key algorithm. The symmetric key algorithm provides rapid encryption and decryption, but a cryptography key is liable to be compromised in the key management and the key distribution since an encryption key and a decryption key are the same key. [0008] Typically, the operation time of asymmetric key algorithm is lengthy. Hence, a random secret key is often shared and used by communication entities to encrypt and decrypt information according to the symmetric algorithm. [0009] The secret key can be shared among the communication entities by inputting a same key into a module of the entities by a user in an off-line manner, or by generating the secret key based on the asymmetric key algorithm. [0010] A new scheme has been proposed for the sake of the user's convenience, which transmits and shares a secret key over a location-limited channel with a remote controller located in a vicinity of a controlled device. [0011] In the related art, it is deemed that the location-limited channel, which is the physical contact between the remote controller and the controlled device, is secure against attacks such as eavesdropping. Yet, an audio channel, a radio frequency channel or an Infrared Data Association (IrDA) channel may be vulnerable to attacks from eavesdroppers. [0012] To overcome those disadvantages, an authentication method has been presented in consideration of characteristics of the location-limited channel, that is, the vulnerability to the attacks. This authentication method transmits unconcerned information even when the location-limited channel is subject to eavesdropping, but requires a general network channel to share the secret key. [0013] In more detail, authentication information relating to the public key is transmitted over the location-limited channel of the remote controller, and the controlled device transmits to the remote controller a hash value with respect to the used secret key. [0014] When the communication channel is established, the remote controller transmits the public key, and the controlled device extracts authentication information using the public key and compares the extracted authentication information with the received authentication information. If the two authentication information matches, the controlled device encrypts and transmits its secret key. Next, the remote controller decrypts and recovers the secret key, and authenticates the controlled device with a hash value received via the location-limited channel. Herein, the location-limited channel is used only for the authentication channel. [0015] However, the above method requires a general network channel before sharing the secret key. Initial secret key sharing required for a secured link channel needs to share a key of an upper layer. [0016] In this regard, a method is needed to securely transmit public key information between the remote controller and the controlled device without having to use the general communication channel even when the wireless local communication channel is insecure. [0017] In case that the controlled device intending to share the secret key has the capability to operate the public key, it takes more time for the user to stand by with respect to the operation time. Further, the controlled device in a home network is incapable of operating the public key. [0018] Accordingly, a secret key transmission method using the local communication channel is needed such that a controlled device with low resources and without the capability of the public key operation does not require much time for the operation. SUMMARY OF THE INVENTION [0019] The invention has been provided to solve the above-mentioned and other problems and disadvantages occurring in the conventional arrangement, and an aspect of the invention provides a system and method for securely transmitting and receiving secret information over a location-limited channel even when the location-limited channel is insecure due to, for example, the possibility of external eavesdropping. [0020] To achieve the above aspect and/or features of the invention, a system for transmitting and receiving secret information includes at least one device to generate a ciphertext using public key information that is received over a location-limited channel; and a wireless local communication device to transmit the public key information to the device over the location-limited channel and to decrypt the ciphertext generated at the device. [0021] The public key information may contain a public key of the wireless local communication device, a protocol request signal, and device information of the wireless local communication device. Continue reading... Full patent description for System and method for transmitting and receiving secret information, and wireless local communication device using the same Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this System and method for transmitting and receiving secret information, and wireless local communication device using the same patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like System and method for transmitting and receiving secret information, and wireless local communication device using the same or other areas of interest. ### Previous Patent Application: Method of a public key encryption and a cypher communication both secure against a chosen-ciphertext attack Next Patent Application: Aria encryption/decryption apparatus and method, and method of generating initialization key for the same Industry Class: Cryptography ### FreshPatents.com Support Thank you for viewing the System and method for transmitting and receiving secret information, and wireless local communication device using the same patent info. IP-related news and info Results in 0.17132 seconds Other interesting Feshpatents.com categories: Computers: Graphics , I/O , Processors , Dyn. Storage , Static Storage , Printers |
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